This large neolithic tomb, also known as Greengraves, is hidden off a Northern Irish road.

Northern Ireland's church-turned-skate park.

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

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

A series of stained glass artworks that depict images of the hit TV show.

Museum preserving torture methods from the past.

This collection of 20th-century toys is filled with a lifelong personal toy collection brought from the U.S. to Amsterdam.

A line number in Amsterdam that will likely never be used again due to its tragic history.

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

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Where royalty waits in the height of luxury.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

An opal mining town in the middle of Australia where people live, worship, and shop underground.