A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

America's only nuclear missile silo open to the public.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

See massive fossils that are over 200 million years old in northeastern Arizona.

A reproduction of earth's many biomes.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Most-visited and most-photographed slot canyon in the American Southwest.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

A stunning two-story timepiece within a medieval Brick Gothic church.

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

Thousands of artifacts tell Mongolia's military history, from the Bronze Age to the present.

A toxic ghost town sitting atop a massive coal fire.

The steepest classic funicular in the world glides along a dizzying incline.

This massive solar system model is sprawled out across Maine's suburban wilderness.