The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A mental health hospital dating back more than 139 years, now features a museum.

A research lab and hands-on museum where visitors can experiment with retro technology.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Hunt for buried treasure in Nova Scotia.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

There is a small island in the Gulf of Nicoya where the only human inhabitants are dead.

One Costa Rican island is so beset by illegal shark poachers that the local rangers have built an entire bridge with their confiscated gear .

Disused penal colony features prisoner artwork, some sketched in human blood.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Costa Rican accommodation resembles a crash site, but with a nice balcony.

At HopCat, a marker honors fictional creatures with the ability to travel the missing dimensions of Kcymaerxthaere.

One of the indelible moments of the American Revolution took place at this location.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.