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

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large part in Dublin.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

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

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

A public art installation with a nautical themed poem, enhances this pedestrian street.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

The attic of a four-century-old canal house hides a clandestine church.

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A shrine dedicated to a 10th-century samurai emperor, whose head is not buried on site (contrary to popular belief).

An enormous pair of straw sandals woven in the traditional way—to keep demons at bay.

Rows of stone statues are dressed up to mourn children that are lost before birth.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.