The last standing puppet theater on Long Island.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

This ancient fortress in Iran was once the oldest and largest treasury in the world.

No monkeying around, this fountain was really named after the classic sci-fi film.

Most prolific publishing house in the 1600s open to the public.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

This charming, hidden guild museum holds some 700 years of crossbow history.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

When you're a great Russian Tsar, even your vomit gets a statue.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

This vast collection of smoking pipes from across the world spans centuries.

This cheese shop also houses a museum devoted to Dutch dairy.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A floating cat sanctuary on an Amsterdam canal.

Cat art as far as the eye can see.

The attic of a four-century-old canal house hides a clandestine church.