Use a key to unlock this medieval sewer tunnel.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

A colorful architectural gem in Seattle's uniquely modern Central Library.

The lost library of Alexandria, revived as a spearhead of cultural preservation.

Discovered in a peat bog, these horned helms come from a thousand years before the Viking Age.

This Ocean Drive crosswalk has been paved in rainbow colors to honor the LGBTQ+ community and the man who brought pastel to Miami Beach.

This gilded emblem was once stolen by a Cookie Monster impostor, who demanded a charitable ransom for its return.

Why walk on this historical site when you can zoom down instead?

A small hippo-shaped fountain in Berlin, Germany.

This functional solar system model was inspired by the famous Eisinga Planetarium.

An installation that makes understanding the size of the universe a walk in the park.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Positioned outside a church, this sinister folkloric figure incited protests in both 1902 and 2002.

Above the door of a house, a plaque claims to commemorate the future living place of the inventor of time travel.

Honoring the star of the “The Bob Newhart Show” which took place in the city of Chicago in the 1970s.

The oldest residential street in Europe also features an optical illusion.

One extremely determined man's homemade universe.

Meet the "Green Monster" of Monico, Wisconsin.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

A sculpture of a giant man escaping from the depths of the Earth.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

This fiberglass version of the Awakening sculpture by Seward Johnson, now resides in its third location in Italy, in Viterbo.