This small chapel is built of human bones and decorated with a golden skeleton.

Perhaps the most spectacular grotto along the Algarve coastline.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

The singular ruins of a mysterious lost city.

This lost city belongs to one of the earliest civilizations in the world.

The equator passes through this tiny island in the eastern Atlantic.

Hundreds of caves filled with thousands of centuries-old statues and murals.

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

This massive blockhead sculpture hides an entire library.

The beautiful baroque library of the Hapsburg empire.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

This influential Renaissance-era library was once the haunt of kings and monks.

A wonderfully eccentric Victorian-era museum and library.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

The curios of pharmacist and collector Henry Wellcome.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

At the United Kingdom's only residential library you can sleep among the books.

While this is positively the smallest library in Canada, it aspires to be the smallest in the world.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

The library of every book lover's dreams.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.