Thousands of flowers create enchanting pink tunnels over the city streets.

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

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

An industrial relic is now one of Europe's most staggering art spaces.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

The world's largest collection of the world's largest objects is in one small Illinois town.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

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

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

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

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.