In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Lie in a hammock where George Washington stood.

A semi-scholarly approach to sex.

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

This elaborate tunnel is the first structure composed of cast concrete in the United States.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This secluded ruin was once a home for exotic plants.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

Ride the subways of yesteryear.

The only subway station in the city that still makes use of gap fillers.

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

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Red frames showcase remnants of one of New York's original subway stations.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

An enormous illuminated figure dances on the Las Vegas strip.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

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