"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

A 30-acre garden inspired by the principles of modern physics.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This artificial cave looks like something out of a fairytale.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Two stunning 17th-century libraries and a cabinet of curiosities.

Walk through Czech history in Prague's largest graveyard.

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

Macabre astrological automaton clock dating to the late 1400s.

A complicated contraption for telling time by the moon.

A stunning two-story timepiece within a medieval Brick Gothic church.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

The site of the first battle of World War II.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

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

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

Summer in Scotland begins with a spectacularly wild and colorful event rooted in ancient pagan traditions.