Deep scars on the earth left by the Ice Age.

Take a drunken tour inside the world's largest known geode.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

A mysterious light of unknown origin on the backroads of Missouri.

An urban forest overtakes what was the greatest failure of utopic urban housing.

Giant granite rocks standing end-to-end like a train of circus elephants.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A nostalgic bibliographic gem.

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.

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Washington's iconic carousel has a nice piece of Civil Rights history.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Look closely and you’ll notice that the color changes a third of the way up the tower.

A line of blue paint marks the route of the inaugural parade.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.