A lush indoor jungle fills this bustling Madrid transportation hub.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

An alien church provides much needed silence in the midst of a Finland shopping center.

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

Stockholm's tiniest statue is of a small boy looking at the Moon.

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.

Stockholm's deepest subway station is also a stunning ecological wonder.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

The Guardian of Tallinn.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

"There's nothing there," and other lies the KGB told us.

A surreal statue honoring Prague's favorite literary son.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A mocking tribute to the past and modern leadership of Prague.