The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

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

A spiritual vortex among the red rocks in Sedona.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

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

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

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

A medical facility that has been kept frozen in time.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

The graves in Florida's oldest Black cemeteries are marked with shells, stones, and mementos of the deceased.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

This stately clubhouse has showcased German-American culture for over a century.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.