Go inside to really appreciate this 500-year-old technological masterpiece.

A blunder resulted in these charming stone-lined streams becoming the target of a Nazi bombing.

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

A plaque on the base of this statue holds a bewitching design.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

A typographic tribute to the many comedic greats who make Great Britain laugh.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

In this medieval fish bowl, the carp weren't pets.

This unique Lady Liberty is one of the only examples of the figure sitting down.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

This huge metal monument is slowly being stripped to its concrete skeleton.

A Serbian church lit by chandeliers made of weapons.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.