This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

One of America's oldest Antarctic research bases is abandoned but still just waiting for visiting explorers.

The best place to send your postcards home from Antarctica.

A chilly monument dedicated to the French explorer, Jean-Baptiste Charcot.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

The world's largest fully steerable radio telescope.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

An entire town preserved as a historic landmark.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

The smallest post office in the United States is no bigger than a broom closet.

The biggest solar telescope in the world helps reveal the secrets of our sun.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A world-class observatory in the California desert.