In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Museum dedicated to "the man who moved the Earth."

An impressive monument to Poland's independence.

Relive a Polish uprising via an enormous, century-old cyclorama.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

Real bones which are said to have belonged to a Polish dragon.

An underground city of salt.

Cold war icon and onetime "hole" in the iron curtain.

Berlin's old airport.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Cliffside houses provide a spectacular view from their perch above the valley.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

An ancient Egyptian temple in the middle of Madrid, Spain.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Commonly acknowledged as the only public monument to the Devil himself.

A giant chess set, minus the psychedelic drug trip.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

From the Difference Engine to the Cray-1, all under one roof.

This giant shopping mall still holds signs of its automotive past.

Historical trolley restoration and operation at History San Jose, Kelly Park.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The headquarters of a secretive order is also a beautifully-designed park.

An extensive collection of ancient Egyptian artifacts and mummies.