A massive sculpture of an obscure Celtic coin that has become a symbol in Slovakia.

The oldest living tree in Manhattan comes shrouded in sinister legend.

An arcade packed with a rotating collection of unique independent video games.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A terrific purveyor of natural history objects and curios.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The heaviest gold coin ever minted.

"Unity, Creativity, Beauty."

A swan-like monument on Obad's Hill honors those that defended the area from German invaders during WWII.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

A museum dedicated to one of Portugal's most celebrated writers.

This now abandoned restaurant provides some of the most amazing views of Lisboa.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Where the lovelorn find a home for their sentimental keepsakes.

A modern, secular take on a traditional Virgin Mary motif.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

There are no crying babies in this neck of the woods.