A cheeky architectural easter egg.

Europe's second largest ossuary wasn't discovered until 2001.

An army of sleeping knights sculpted by a self-taught local artist beautifully depict an old Czech legend.

This copy of the famous Prague Astronomical Clock is the result of one man's passion project.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

A sprawling Victorian farm that has been surrounded by a capital city is one of Canada's greatest treasures.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

At the time of its completion, it was the tallest dam in the world.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The world's oldest bookshop still in operation.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

Tiny communists hammer away on the Olomouc Astronomical Clock.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”