A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

A historic Georgian building and warm springs.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

A series of playful yellow penguins share a serious message about the environment.

The fifth-longest natural arch in the world, and the longest outside China.

This unique collection of lawnmowers includes vintage blueprints and automatic robot mowers.

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

A rotating bridge that carries a little canal over a larger one.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

One of the largest mechanical models of the solar system in the world.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

At an isolated roadside rest area stands a monument marking where famous Western star Tom Mix died in 1940.

A harrowing sculpture commemorates the four people shot down during the workers strike of 1842.

For over 100 years the most important physicists in the world have autographed this university wall.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A winding district gerrymandered into the shape of a mantis.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.