A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Lonely minaret stump of a destroyed city.

Time capsule of a museum, in which the Soviet Union remains alive and kicking.

This Soviet statue is based on a piece of propaganda that's been elevated to national myth.

Beatlemania is still going strong... at least in Kazakhstan.

In Kazakhstan, a colorful cathedral with many lives once survived the most powerful earthquake in the region.

Looking for a unifying history, Uzbekistan finds its answer in a 14th Century Turco-Mongol conqueror... despite the fact he wasn't Uzbek.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.