This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Eighty million natural history specimens call this gargantuan museum home.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Baroque celebration of the end of the Great Plague of Vienna.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Thousands of well-dressed mummies below a monastery.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

The mark of the Devil's horns on a marble column in Milan.

The secret medieval communication system will whisk your words above the noise of the crowd.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A fairy tale castle in modern Rome.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.