One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

An encyclopedic collection of mammal penises.

Iceland's tribute to its thankless civil servants.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Walk in the footsteps of the gods and straddle two tectonic plates.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

An underground city of salt.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The site of Paul Revere's historic two lantern warning.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A Civil War Museum with some notable medical antiques.

According to local history, this cast-iron canine was nearly melted down for bullets during the Civil War.

This recreation of a 19th-century dime museum is full of oddities.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This plaque marks a place where one of Hollywood’s most famous dancers got his start.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

Island where motor vehicles are banned -- home to the only carless highway in the United States.