A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

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

A huge musical instrument played by the ocean.

The world's only museum devoted to the wonders of fluorescence.

A medieval setting reimagined into a unique art alley.

The oldest continuously operating pharmacy in Europe.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

A Jenga-style cylindrical tower of books that appears to go on forever.

Under the right conditions, rocks will move across this dry lakebed, leaving trails behind them.

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

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

A unique book shop with a collection of rare tomes and a nostalgia museum.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

A Saxony castle houses one of the largest and most outstanding mineral collections in the world.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

A German apartment building hosting as many trees as human occupants.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

An intricate and amazing house built by architect Karl Junker.

A six-story, asymmetrical tower filled to the brim with scientific experiments.