“Invented in Key West, Perfected in Brooklyn."

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

It's clear this abandoned Art Deco gem was no ordinary cleaners.

Norway has built what may be the world's most beautiful public toilet.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

One of the world's largest collections of rare and magnificent bird specimens.

The winter home of thousands of beautiful snow geese and sandhill cranes.

Eritrea's futuristic gas station is a nod to Italy's fascist history.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

Christ's blood preserved in a Belgian town.

At this research institute, the chile is king.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Eulogizing an unknown man's unusual demise.

In California, colorful roadside signs remind us all that love transcends borders.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

The world's largest public collection of PEZ memorabilia.

Two massive and unstable sinkholes are yearning to unite, and their consummation could be catastrophic.

This quirky outpost and gallery inside a former church is an unexpected trove of handcrafted art.

A surreal museum of extraordinary industrial objects.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

A tiny monument to the classic American candy.