There has been an astronomical clock on this spot since the 14th century.

A remarkable two-country morph, this town is part of Germany legally but is by all other measures Swiss.

Everything from alchemy books to building plans for the Eiffel Tower are housed inside this museum.

A charming little museum founded by the designer of the Statue of Liberty.

Started as a kitchen garden, now the second largest botanical garden in the world.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A former Nazi lookout tower with a magnificent view of the Rhineland.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

This tremendous timepiece was once the largest cuckoo clock in the world.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Tiny castle in the middle of the Rhine made you pay to pass.

This marvelous array is one of the largest collections of mechanical instruments in Europe.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

This 600-year-old home seems to defy physics.

World's largest barrel containing an inn.

A former ironworks that was the first UNESCO industrial site.

A tiny chapel clings to a precipice above Germany’s gemstone capital.