A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A ruined Maya city that suffered a years-long case of mistaken identity.

A subterranean house of worship carved right out of the bedrock.

Quito's historic, main square dates back to the 16th century.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

Constructed on the ruins of a convent, this tower saved countless lives.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

A bright little alley in La Boca is a part of tango history.

Single runway interrupted by a busy road that cuts across its middle.

A menagerie of concrete animals brought together from across New York City's parks.

The most confusing clock in New York.

This private mansion turned Catholic bishop’s home is an iconic Galveston building.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

The saga of the massive nut begins and ends in Texas.

A city park that sits on top of a freeway.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

A few times a day, you can see an animatronic cowboy shoot-out.

The Grand Canyon of Texas.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

More than 21,000 images fill this overlooked gem of a prehistoric site.