One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Decades before the scandal, this staircase on the river was a literal "water gate."

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Stone markers on the campus of Gallaudet University commemorate a peculiar school tradition.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The tunnel under the Capitol Building where Congress takes out its trash.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

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

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

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

A cemetery housing wild west legends in South Dakota.

A fitting attraction for the corn capital of the world.

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

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

The ravine where Jesse James supposedly performed an impossible jump to evade capture.