St. Augustine's record-setting narrow street was designed to protect against pirates.

It's a pretty creepy lock-up.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

This small-town pizzeria won the Hollywood lottery.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A spiritual vortex among the red rocks in Sedona.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

This Native American settlement dates back to the Pueblo II period.

The remnants of a creative early method of wildfire prevention.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

One-time largest man-made structure in the world will be a park in 30 years.

A town trapped in time - 1958 to be exact.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

Neoclassical bank designed by NY architects Helmle & Huberty.

New York's southernmost subway station is whimsically wavy.

This innocent-looking townhome is actually a subway exit.

Oldest synagogue in the United States.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A contemporary fresco movement illustrates the region's rich history.

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