The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Morocco's largest Jewish cemetery.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Colorful and chaotic stacked hotel in North Holland.

Monastery complex at the location where bodies of the executed Romanov royal family were discovered.

Church built on the site where the last tsar of Russia and his family were killed.

Former prison camp dedicated to the victims of political repression.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

Replica of mosque destroyed by Russia in the 16th century.

Russia's own leaning tower was built on a tragic historical fable.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Pop culture has helped to keep this iconic British building from being destroyed.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.