Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

A hip bar decorated with walls of golden skulls.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Paris' linguistic guide to the international language of, yes, love.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A layered tribute to the work of mosaicist Isaiah Zagar.

Elevated freight railway turned wildly successful urban park.

World's first "penitentiary," meant to be humane, drove men insane.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A French artist's vague warning hangs over Belleville.

This bridge was constructed from the rubble of the infamous Bastille.

Historic medieval fortified city in southwest France.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

France's most famous cemetery, with some of its most curious tombs.