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

These markers are used to document elevation changes around the famed dam.

An enormous illuminated figure dances on the Las Vegas strip.

An exotic wildlife habitat right off The Strip.

Every drop of D.C. tap water flows through this old waterworks.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

There must be a pun in this haystack somewhere...

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.

A bit of retro transportation flair preserved in the world's largest department store.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

The "Seinfeld" diner.

Elevated freight railway turned wildly successful urban park.

A daily replay of the experiment that proved the rotation of the Earth.

In the early 1800s, surgery was also a show.

This private residence was the template for one of the most beloved television homes of all time.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

A building so large that it has its own weather.