Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

The remains of an entire Roman city can be explored in this interactive museum.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This chimerical bridge/tunnel appears to dead end right into the sea.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Travel deep inside of Europe's second largest glacier in the world's largest man-made ice cave.

The beautiful baroque library of the Hapsburg empire.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.