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

Go surfing on this urban wave, "hacked" by local surfers.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A haunting collection of the vanished and disappearing natural world.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

This museum houses an imposing skeleton army comprised of creatures great and small.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The ancient tomb acts as a calendar that keeps perfect time.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Famously misunderstood wonder of the ancient world

An unusual round church in London with a Templar past.

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Rebuilt remains of a temple to Roman god Mithras.

Hear the quietest sound from across the dome.

London's smallest police station is barely the size of a phone booth.

The largest greenhouse in the world is home to over one million types of plants.

Unconventional site where the tracks of Zurich tramcars intersect.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Modern art meets modern convenience in possibly the world's most architecturally important public bathroom.