Berlin's old airport.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

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

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The "Little Ones," show Portugal in full miniature splendor.

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

Eat the ultimate iteration of Portugal's most beloved pastry.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

Though they've since been renamed, these two streets hint at Dublin's darker days.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

Inside Cork's Kent station stands its country's longest-serving postbox.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

Christ's blood preserved in a Belgian town.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The bronze uniforms commemorate the vital role of women during World War II.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

The wooden grave marker of a railroad worker who died in a freak whirlwind.