The only Bahá'í house of worship in North America and one of only a handful worldwide.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A lush green oasis in the middle of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

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

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

This bridge was constructed from the rubble of the infamous Bastille.

Paris' linguistic guide to the international language of, yes, love.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

An ancient knight and a symbol of the city's freedom.

Where the lovelorn find a home for their sentimental keepsakes.

The site where the leader of the Kosovo Liberation Army was killed is now a memorial.

This 15th-century Ottoman bridge was modified to keep up with the changing course of the river Erenik.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

The ceiling of this cavern is dripping with multicolored marble stalactites.

Christianity and Islam have clashed, yet here a Serbian Orthodox church and a mosque stand together.

A 11-foot former president stands on a Kosovo street that also bears his name.

A futuristic, brutalist masterpiece that is also strangely prison-like.

A public work of art that also provides some relief from the summer heat.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.