Missoula has a lot of outdoor recreationists and because of that several mountains are loved, but I wouldn't say anything is sacred to the community. I am also not aware of what might have been sacred in the past. I should look into this.

The watershed I grew up in has many sacred geological formations. In fact, traditionally most things are believed to have souls. That includes rocks. :) One of the most sacred landmarks is Chief Mountain, which happens to sit on the dividing line between the US and Canada. It was often used as a destination for spiritual quests. There are many stories and even a prophecy about it.

Mount Tamalpais and the Golden Gate were I believe both looked upon with respect if not reverence by native people's, and have remained important to populace as symbols of natural world.

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The vernal pools of the central valley of California

that have all been nearly completely paved over for suburban construction

I live in an area visited by Lewis & Clark. The waterways of my watershed are all considered sacred. Environmental groups have done a relatively decent job protecting these areas.

Naturally the gold miners loved the gulches around Helena. The local American Indians had sacred sites along the Missouri River. Lewis and Clark honored the Gates of the Mountains, which is now a tourist attraction accessible only by boat or by hiking or horseback for many miles.

The ridge-line is the most recent. On the hills surrounding the valley. Homes were never to be built along the top. They were to be built below so that trees could be planted around them, surrounding them, to obscure them from view. All it took was one developer hiring teams of construction crews to work overtime, on weekends (when county building inspectors and officials are off), building "mistakenly" at the highest elevations on the properties. Along the ridge line. When local preservation groups go to court to try to stop it, you find that somehow there was miscommunication in the Planning Dept, the developer's permits are in order, and to block it would mean a lawsuit against the county, which the newspaper will report "Developer likely to win." Once they get away with it, precedent has been set for all other developers to build on ridgeline.

Vista. Open space. Nothing rising out of the ground to obscure the view for the people of the valley. No high rises. That one is just now at the brink. The city has approved permits for the first ever high-rise. Great commotion, public meetings, "17 stories is too high, cut it down!", and they did, to 13 stories. There seems to be pivotal moments that start the erosion of the "sacred." For this it was a golf driving range, 90 ft. poles holding nets, built in the center of the valley along one of the major traffic routes around town. This was the result of another "mistaken" permit being granted. Once built, the government authorities are loathe to force the builder-owner to comply. In this case, the public hearings were so contentious that the government and the builder colluded by stalling the disposition of what would be done out over months, wearing the public down. In the end, there was a negotiated settlement between the city and the builder-owner, which included shortened operating hours, lighting restrictions, requirements for maintenance, etc. In the five or so years since, the property-owner has failed to keep his part of the agreement (the poles were to be kept in good repair, freshly painted at all times). The poles, which were never painted, are now a splotchy rusting eyesore. I think the homeowners in an adjacent subdivision who had been the driving force behind the complaints probably moved, and the new homeowners bought in knowing that this property existed.

The competition between agriculture-ranching and suburban sprawl. Ranches and farms are being sold to developers and subdivided into housing and shopping malls. Within what's left of agricultural parcels, the types of crops grown which was also sacred (with agricultural diversification prized) is all changed. Now it's mostly one crop - grapes.

A laguna that meanders throughout the county. It's protected, but in the last 20 years it's been encroached on, built into, which has led to massive flooding and damage in other developed areas now that the rains have no place else to go.

Hot springs, renowned for their healing properties.

The ocean.

Started thinking lately about the extent of a defined community and the places that community reveres. On the south end of the Salt lake valley is a very large steep sandbar left over from prehistoric Lake Bonneville. Aside from the gravel pit at one end, in my youth it was known as "widowmaker" one of the best, toughest motorcycle hill-climbs around. Today, the hill remains, the scars looking like an erosion hazard leading to someone's backyard in a gated community.

So, who gets to define "sacred" or "community?" Which community or sacredness takes precedence? How long to establish sacredness of place? Is the burial location of a nomadic tribe sacred? does it depend on the contemporary beliefs of that specific tribe, or the european beliefs of burial places as sacred?

Which mountians are sacred? I'm a mountain person, I believe all are. How do you treat a sacred mountain when part of it's sacredness is the size and permanence that placed it before all our lifetimes and after all our lifetimes. How big a scar is too big? Even the scar will find it's angle of repose when humankind is finished with it.

So, all and none....

Bald Hill was a lookout point from before the 1400s.
It's a nothing, now. You can't even get to it without
going through somebody's yard.

Look to legends, if they are recorded. Also check newpaper articles about construction. For example, the new Denver International Airport actually had an exorcism done by the local tribe because it was a burial site, and they wanted to make sure the place didn't get haunted!

The dirt is sacred, it's an agricultural community.

Great Falls of Paterson, 2nd highest waterfall in North America!