An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

The island where one woman reigned as a "queen" over 30-odd Japanese soldiers who refused to believe that WWII had ended.

A ghostly mansion in the middle of downtown Tunis.

Thousands of graves lurk below the surface of this park.

Austrian and Germans who died on British soil during World War I and II are buried here.

An aeronautical-themed resort forged around rusty relics from the golden age of air travel.

The final resting place of soldiers who fell during the First and Second World Wars.

One of the most important Krio heritage sites in the country.

The first European-style university in western Sub-Saharan Africa.

A seaside cemetery honors the Commonwealth soldiers and sailors that died in Sierra Leone during World War I and II.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

Beneath an ancient wishing tree lies an underground chapel with 12th-century frescoes and catacombs dedicated to a lady saint.

Mobsters came for a soak in the hot springs, and stayed for the illegal gambling and bootlegging.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

A menagerie of concrete animals brought together from across New York City's parks.

More than 100 years after his death, the world's largest steer is still attracting crowds.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

A short hike into the mountainside forest reveals a decaying 1890s town.

The remains of a deserted 1800s farming community can be found in Little River State Park.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.