A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Stunning Roman aqueduct used for 1900 years and still standing.

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

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

An architect transformed this abandoned cement factory into his castle-like workshop.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

This cemetery features modernist statues as strange as its name.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Dozens of snakes are housed and worshipped within the walls of this Vodun temple.

An ancient burial ground believed to have been used for ritual sacrifice.

Ancient artists in the middle of nowhere.

Road signs in Namibia mark the location of one of the five major circles of latitude.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A church filled with the bones of hundreds of virgins martyrs—or so they say.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.