These medieval skyscrapers dominate the skyline of this small Tuscan town.

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

Italian cave with exceptional acoustics and an unsavory history.

The world's most active stratovolcano is almost always erupting.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Thousands of well-dressed mummies below a monastery.

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

Pompeii's less famous neighbor is still revealing her secrets.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

A tree that defies gravity grows in an ancient ruin.

“The oddest pub in South Africa,” inspired by a practical joke.

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

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

Largest cave system in Africa.

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

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

A house built from trash known as the poor man's Hearst Castle.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

A complex of six forts embedded in the Rajasthan hills.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.