A fascinating insight into daily life in the Eastern Bloc.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

This abandoned bunker looks out over the Atlantic from its clifftop perch.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A geological bull's-eye visible from outer space.

One of the largest necropolises in the world is home to a stunning array of historic Middle Eastern tombs.

Lunar landscape, a mud volcano and bizarre rock formations.

A city entirely devoted to illegal gun production.

Unique pagan culture in three extremely remote mountain valleys.

The Great Wall of Sindh, Pakistan's mighty fort.

Reputedly haunted sandstone necropolis with exquisite stone carvings.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

A 17th-century mosque that was used for war more than worship.

Space-age minarets towering over Islamabad.

A mere stone's throw from Islamabad exists a spectacular display of three millennia of humanity's progress.

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

Massive fortress bastions in the desert of Cholistan.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Walk through the history of American pop culture.

This free, take-a-book shop seems like a trick but isn't.