Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

A sharp sculpture made of thousands of pieces of jagged glass.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

The only ancient site that remains on the south bank of the sacred Ilissos river.

Gladiators once walked this ancient, subterranean passage.

A memorial to the only dog ever officially enlisted in the Royal Navy.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

Italian cave with exceptional acoustics and an unsavory history.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

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

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

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

100 year tradition of fist fights, marked by marble footsteps.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

A tribute to the "toughest woman on the Texas frontier," who survived a famous battle and five husbands.

Turning night into day in Victorian-era Austin to thwart a serial killer.