The highest point in Maryland is only accessible by hiking through another state.

This attraction is devoted to the wonders of steam power and features a replica of one of its most public disasters.

The most radioactive spot in New York City can also fix your muffler.

The smallest post office in the United States is no bigger than a broom closet.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

A remarkably intact castle that once was the largest in Ireland.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

The trials and tribulations of marking Poe's grave.

Erotic art covers the walls of the largest ancient pleasure palace.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This failed condo development was reborn as a street art hub.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

A promotional sun clock on the site of San Francisco's great raceway.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

Huge stone depressions which may have acted as an Incan agricultural experiment.