A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

This elaborate towering structure was once famed for its revolutionary height.

Slyly buy a shake in the Parker Meridien lobby.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

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

Yo, Adrian!

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

One of the indelible moments of the American Revolution took place at this location.

The homestead of American patriot John Adams.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

The first American department store, and home to the largest operating musical instrument in the world.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The magic's in the hole!

Portlandia is the second-largest copper repoussé statue in the United States.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Lemon Grove, California is known for its giant lemon...and mummified bodies.