A sixth-century Byzantine cistern hidden below a modern carpet store.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

The most metal church of all time was built in record time because of an international, pious pissing contest.

1513 Turkish world map, full of European state secrets and snarky commentary.

Step back in time and witness the fall of Constantinople.

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

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This eatery re-creates dishes from the Ottoman Empire so you can dine like a sultan.

Turkish adventurer antiques in the heart of the Grand Bazaar.

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

The ornate miniature mansions were built for Istanbul's feathered residents.

A marvel of Byzantine engineering under the streets of Istanbul.

One of the largest caves in the world open to the public.

The Adriatic's most famous wind can be reliably experienced in the city's Marina.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

A massive tribute to Estonian history and culture.

Take a seat and hear a song by the composer Frédéric Chopin.

A unique sculpture calls the outside of this steakhouse home.

This set of concrete chambers resonates according to different notes of octaves.

A series of concentric circles represented a bold new experiment in socialist urban planning, and it notoriously difficult to get around.

This former medieval prison now unlocks Estonia’s rich photographic history.

An underground nightclub helped spark a "Singing Revolution."

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

Only a fragment of this 15th-century Dance of Death survives today.