Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

France's third-largest necropolis offers a peaceful respite from a busy port city.

Ancient ruins hidden underneath a modern luxury hotel.

Located near Cairo's El Korba district, the abandoned mansion continues to inspire mystery and rumor throughout the city.

These ruins reveal the remarkably intact layout of a Roman marketplace.

Made famous by "Star Wars," these troglodyte homes face an uncertain future.

One of the most well-preserved temples of ancient Egypt.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The eclectic observatory castle of a 19th-century astronomer and explorer.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

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

The ancient abodes are a testament to human ingenuity amid harsh climates.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

The 20-mile causeway that separates the Netherlands from the sea.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

The world's tallest bridge is also possibly the most elegant.

This ancient city - home to nine civilizations - is soon to be buried under 200 feet of water.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.