The largest mosque in Germany.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Fantastic views and thousands of love locks.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

Witness traditional silk production in the Uzbek city that's been a hub of sericulture for over a thousand years.

One of the most ethnically diverse spots on the planet.

The remains of an ancient city-state along the Silk Road.

The foundation of this ancient stupa dates back to the 1st-century.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

Hundreds of Buddhas in a re-discovered Indonesian temple.

The ruins of an abandoned 17th-century fort that was almost completely destroyed by a fire.

This 17th-century Bhutanese monastery is ensconced in Buddhist legend.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

Sacred Buddhist home of some spiritual monkeys.

This historic square in Nepal is home to temples dating back to the third century.

This is one of the last surviving structures of a once vast palace complex.

The oldest Hindu temple complex in Nepal serves as the seat of Nepal’s national deity, Lord Pashupatinath.