The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Where beautiful signs live on forever.

An abandoned munitions factory with a shot tower continues to wage war on the surrounding environment.

This huge clock made of flowers and simple machinery was once used a political weapon.

The 34th governor of Kentucky was sworn into office while on his deathbed after being shot outside the State House.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Dedicated to one of the darkest moments in Irish history.

3,200-square-foot mural inside Dartmouth Library depicts the history of America with images of human sacrifice, ancient gods, and other unspeakable terrors.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

The first declared National Monument in the United States.

The first memorial dedicated solely to the Black troops who fought for the Union.

A relic of FDR's brief foray into utopian urban planning.

One of the oldest surviving Swedish-American homes in the United States.

Yo, Adrian!

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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.

In this relatively flat state the highest point is an honored place.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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