This empty Detroit high school was too expensive to maintain or destroy.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

An ornate Detroit church, left empty and ravaged by time.

The pieces in this sculpture garden are made from demolished buildings that were once landmarks of Motor City.

The bones of an old zoo crumbling in the shadow of a new one.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

Swedish skyscraper with a 90° twist.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

One of the greatest maze designer’s greatest mazes.

Race through the maze, get your name on the sign.

A peace symbol in Northern Ireland is among the world's largest hedge mazes.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

The longest hedge maze in the world.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

Venice's "Island of the Mad."

Venice's island of the dead.