These 500-year-old frescoes depict the city in its glory days.

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

A black sand beach where glacial fragments wash ashore and look like sparkling diamonds.

An old pay phone rewired to play local bird calls and songs at the press of a button.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

A wondrously macabre treasury of obscure antiques and unusual oddities.

Offal and flawless onion soup are on the menu at this restaurant that once catered to the workers of Les Halles.

This oddly shaped boulder in Paris is rumored to be cursed.

For many years, the river that Julius Caeser led his army across into Italy was lost until re-identified.

It's believed that the dead were once taken out of houses through these now walled-up doors.

This retro diner claims to be the birthplace of poutine.

This 10th-century seaside abbey holds spectacular views and a window into the past.

Inaugurated three times, this tower offers some of the best views of Madrid.

An archway adorned with vulnerable flora and fauna.

A museum dedicated to telling lies in service of the truth.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

This garage is frozen in the late 1990s, full of rare and untouched cars and motorcycles.

What began as a prominent Burning Man art piece is now an iconic symbol of downtown Reno.

This gilded emblem was once stolen by a Cookie Monster impostor, who demanded a charitable ransom for its return.

Dedicated to the neverending mathematical constant, this plaque next to a park bench was sponsored by an anonymous benefactor.

A non-stop elevator ride in Vienna's city hall.

This Art Nouveau mansion was used as the "House of the Screaming Child" in Dario Argento’s giallo classic.

Get in line for Lisbon’s most famous sandwich.

A ceramic postbox where visitors can post original poems and creative messages.