The first declared National Monument in the United States.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

Every president in history is immortalized in bronze in downtown Rapid City.

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

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

The only rotating bar in New Orleans has been slowly spinning since 1949.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

This stunning concert hall has become a symbol of Iceland's national recovery.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The second oldest continuously operating bar in Louisiana.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

Baroque celebration of the end of the Great Plague of Vienna.

The beautiful baroque library of the Hapsburg empire.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

This strange statue features a bust of the famous composer plopped atop a woman's body.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

The medieval network of canals hidden underneath the city is opened to explorers each year.

Terrifically morbid cemetary and site of famous Paracelsus' grave.