One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

The only remaining U-boat that is still floating never actually saw any action in World War II.

Constructed by forced laborers, this submarine pen is now a museum and war memorial.

World's most expensive home.

An extraordinary "City of Caves" carved from solid stone.

A gigantic shoe, inspired by a nursery rhyme, sits in a park atop Mumbai’s Malabar Hill.

These animal carvings stand as representations of India and Britain.

A Hawaiian stairway to heaven—that you can't climb.

This fountain was once heralded as the largest in the world.

A giant baby floats in the middle of Singapore’s nature park.

Singapore's landscaping project is home to 18 incredible Supertrees.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Remnants from a time before electricity.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

An underground city of salt.

Warsaw's fantastically preserved gasworks...almost.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.