Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

A stack of stones steeped in Irish folklore, much like the hero they're connected to, hide in plain sight.

A narrow strip of land is home to the tallest migrating dunes in Europe.

A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

Theme park featuring miniature replicas of European monuments.

Climb inside an iron crystal magnified 165 billion times its normal size.

The largest catacomb system in the world.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

An eclectic trailer park retreat in the middle of the California desert.

Most famous work of one of Frank Lloyd Wright's sons.

A common entry point to the Griffith Observatory trail holds its own wonders.

World-famous, Pink's still manages to keep its prized cult fetish status.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

A museum dedicated to the dead and the tools used to usher them into the afterlife.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

This aquarium has almost as many world records as it does fish.

Thanks to the building of a life-giving reservoir, part of the Great Wall of China is now a dive site.

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

An abandoned saucer-shaped monument in the Bulgarian mountains.