This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Unique antiquarian shop specializing in globes, maps, and prints.

One of the last Jazz Age "Wonder Theaters" in New York City.

Nondescript elevator doors open to reveal a stunning, surreal world.

Did he come up with a theory of cosmic-ray showers while sitting in this bath?

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The world's largest moose statue towers above the highway between Oslo and Trondheim.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

A sweet museum focused on beets.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A towering monument to war, located on a beautifully peaceful hill.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

A sculptor's dream castle turned fantastical ruin.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

Remnants of the city's Soviet history hover over this modern fast-food outlet.

Double spiral staircases are not unheard of, but they are very rare.

This effigy of Peter the Great is greatly disproportionate.

A replica of the straw hut where Vladimir Lenin lived in hiding, disguised as a hay farmer, in 1917.