A patchwork of ruins from various civilizations in one of the world's oldest continually inhabited cities.

A monumental underground karstic wonderland is also the water source for over a million citizens of Beirut.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

One man’s collection of photography books has transformed into a charming exhibition space.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

This once-derelict building is now one of the most beautiful bookstores in the world.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A clear example of the process of erosion in action.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The fifth-longest natural arch in the world, and the longest outside China.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Fossils, railroads, and waterfalls!

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

A downtown park built on top of unclaimed graves.

The site of Paul Revere's historic two lantern warning.

Legend holds eating just one of these black eggs can add seven years to one's life.