The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

A sweet symbol marks the place where torturous executions were once carried out.

The final resting place of soldiers' loyal canine companions.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A restaurant and observation deck built in a unique broadcasting antenna.

Berlin's old airport.

The prototype for all Nazi concentration camps.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

One of seven Jewish catacombs in Rome and one of only two open to the public.

A huge enchanting public park just outside the ancient walls of Rome.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A nostalgic bibliographic gem.

The United States Capitol's former columns still stand.

Alexander Hamilton’s creation caused quite a bit of controversy.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.