Flamboyant architecture from the turn of 20th century.

Palace where the nearly un-killable Rasputin was murdered.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

Its front wall is striped with a menagerie of fantastic beasts and magnificent monsters.

Gargantuan home of Russian science.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

A former suicide bridge is now accumulating symbols of love instead of a body count.

Stockholm's narrowest alley is barely over two feet wide.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The solemn exterior conceals an opulent interior of this 17th century church.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

The beautiful baroque library of the Hapsburg empire.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

Cold war icon and onetime "hole" in the iron curtain.

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

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

Cat art as far as the eye can see.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.