This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

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

Secret refuge and museum of the Duke of Florence.

Once known for its horse-powered knife sharpening, this 200-year-old shop offers an array of blades and hard-to-find culinary tools.

Feast on the freshest of fish by the Bosphorus.

Eat your way through history.

Come for the whole sides of slow-roasted lamb, stay for the regional Kurdish specialties.

Homesick Syrian refugees head to this restaurant for a taste of Damascus.

This family-owned canteen has been selling goat milk ice cream since 1933.

Wash down heaping platters of meze with raki at one of the city's best taverns.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This museum was invented in a novel before being made real by the author.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

A marvel of Byzantine engineering under the streets of Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A meow-velous tribute to a beloved street cat, made famous on the internet.

This pub has roots dating back to 1430.

Visit the last surviving outlet of a once popular chain of coffeeshops.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

A relic from one of London's worst 19th-century slums.

Possibly the world's smallest museum is home to one exhibit that sheds light on the capital city's dark criminal history.

Limestone outcrop decorated with a large laser engraving of the Buddha.