This grisly headstone doesn’t seem to be resting in peace.

An eerie, decaying ghost town destined to fade into the forest.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

This might just be the TARDIS of bookstores.

How did the right arm of a 13th-century English bishop wind up in a Connecticut church?

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

Avoid gangster interaction while window-shopping.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

A hands-on traveling collection of the innovative devices of yesteryear.

Hundreds of antique bank vault locks on display in New York City.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

An industrial relic is now one of Europe's most staggering art spaces.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Memorial to a beloved puppeteer as well as all street performers.

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.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A derelict bit of transportation infrastructure hidden in the woods.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A building shaped like the Army Corps of Engineers logo, because why not?