This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A cemetery housing wild west legends in South Dakota.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

Fort Garry was a pivotal post for the Hudson’s Bay Company and a major factor in the economy and political culture of the area.

"...I guess that was your accomplice in the wood chipper?"

Home of a French nobleman's short-lived attempt at raising cattle in the Badlands of North Dakota.

An entire city block built completely out of petrified wood.

This colossal reptile celebrates the history of the now-defunct Canadian Turtle Derby.

This park straddling the United States-Canadian border has been a symbol of peace since 1932.

A rim-made reptile in North Dakota.

The world's tallest turtle riding the world's largest snowmobile.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Stunning Roman aqueduct used for 1900 years and still standing.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."