A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

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 cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

This small-town pizzeria won the Hollywood lottery.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Many of the most significant figures in American history once hopped on a stagecoach in this alleyway on their way to more noteworthy destinations.

Delaware's first railroad lasted only five years and spanned only 16 miles, but its ticket office has survived for two centuries.

One of the most colorful free outdoor attractions in San Diego, this park is filled with murals and ties to history.

The world’s oldest active sailing ship.

One of the largest trees of its kind in California.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Despite their macabre past, these hooks are said to bring good luck to those who touch them.

This sturdy, circular stronghold served as one of the forts that protected the Venetian Lagoon.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A massive marble foot is tucked away in a small alley near the Pantheon.

2300-year-old Roman road connecting the empire.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.