A cake-themed art installation tucked away in historic Chinatown.

New York City's only radical feminist independent bookstore.

This last stalwart of the now-forgotten feminist restaurant movement has been serving food in an activist atmosphere since 1977.

One of the most easily accessible examples of the rare 1960s UFO houses.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

A stairway to heaven, or to nowhere at all.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An eerie, derelict amusement park in Berlin.

Op-art architecture designed for happiness.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Dine amidst exotic plants at this former royal greenhouse.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

A haunting collection of the vanished and disappearing natural world.

This museum houses an imposing skeleton army comprised of creatures great and small.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

Stumps of an Ice Age forest, visible only at low tide.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.