Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

This sidewalk monument honors more than 50 civil rights activists who helped change the face of America.

This former prison is an Art Deco masterpiece with a past full of civil rights flashpoints.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This massive redwood tree has a hole in the base big enough to drive through.

An optical illusion found amid a logged redwood forest.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

One woman's Viking Castle on Lake Tahoe.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Odd outsider art installations surround a Gold Rush-era ghost town.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

This historic tower in the California desert promises visitors a "vortex of good vibes".

The ghostly remains of an accidental sea.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The ghost town that ended up on Ebay.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.