No building in the world leans as far as the so-called “Leaning Tower of Abu Dhabi.”

This enormous sports car themed amusement park is home to the world’s fastest roller coaster.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

Whitewashed mosque contains the world's largest carpet.

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

Breathtaking and huge 430 year old maps of Italy.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A swirling spectrum of stained glass dazzles visitors who enter this subway station.

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

The remains of the worst military aviation accident in Canada's history.

Montreal's colorful subway station shows its support of the local LGBT+ community.

This haunted corpse of a drive-in is now a graffiti-covered ruin.

A massive Montreal stadium that has seen nothing but trouble since its inception.