Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

A solemn memorial in a majestic setting that honors a 1692 tragedy.

These fantastically named natural pools look like something out of a Scottish myth.

The longest staircase lock in Britain.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

A close look reveals that the Scottish monument is just slightly off-kilter.

This three-story Victorian mansion is now home to the National Park Service’s Historic Preservation Training Center headquarters.

A Civil War Museum with some notable medical antiques.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

Christ's blood allegedly preserved in a Belgian town.

A little sculpture with a large wardrobe.

Brussels' favorite peeing boy has a sister.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

This colorful gate stands as an entrance to the walled city of Old San Juan.

A monument to the art of slicing people open.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

To find the "unicorns of the deep" you've got to go downstairs.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Breathtaking and huge 430 year old maps of Italy.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.