This antique rail car has been reborn as an urban cafe.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The school tested mustard gas for the U.S. Army during World War I.

A celebrity from the late Cretaceous period.

When flour explodes, it's not a pretty sight.

Funhouse of found art and participatory sculpture.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

Make your reservation to have coffee with some kitties.

A New York garbage depot holds a secret collection of weird and wonderful refuse.