A Tucson museum and performance space full of found-object movable sculptures.

An exquisite grouping of structures made from 10 tons of invasive saplings.

This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.

A high-octane shrine to the greatest Texans who ever lived.

The upstairs reading room is packed with millions of rare books, literary manuscripts, and historical treasures.

A grove of colossal man-made flowers built to collect the sun's rays.

Continuing the tradition of the dime museum in style.

From a distance, Latin America's first Baha'i Temple looks like an enormous egg perched atop a hill.

A no-frills, DIY nature preserve manned by a U.S. expat who has dedicated his life to turtle conservation.

A monument to the conquistador became increasingly controversial in the very city that he founded.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

"Polynesia on the Plains."

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

New fungal and bacterial species call this deadly lake home.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One man's ambition created this psychedelic log home.

Native Americans built this circle of stones, which was used to predict astronomical events.