The bears may be gone, but their old cages can still be found.

No one messes with the Massachusetts sacred cod, not this time...

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

An underground city of salt.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

An enormous, inside-out glass globe built in 1935.

An eccentric inventor's castle home with its own indoor weather system.

Three prestigious academic collections come together to create a world-class natural history museum.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

A cave dug by a man directed by ghosts to find pirate treasure.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

This massive World War II calculator hearkens back to the days when "computer" was a job title.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Solar powered Spectacle Island features all-green facilities.

The poems Nathaniel Hawthorne and his wife Sophia etched into its windows are still visible today.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

35,000 grape hyacinths flow like water down a garden hill.