Site of a former hidden treehouse in New Orleans.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

A snapshot of the city's fascinating voodoo culture.

Enormous sandstone towers loom within a Czech forest.

This enchanting mountain plateau celebrates spooky local folklore.

This riverside restaurant has been serving customers since 1146.

This spectacular track has run continuously since 1882.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

This retro underwater observation tower would make the perfect lair for a sea-loving villain.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Buy a token from the liquor store and you can make this beast spew flames on command.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

There are two legends behind the origin of this unusually tall sanitary structure.

Where else would you expect to find the gravesite of European royalty than the windswept dunes of rural Northern Michigan?

This natural marble cave is one of only five national monuments in Oregon.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

Legend says a giant, venomous spider once dwelled within this Polish church.