This legendary urban waterfall creates a dazzling display of rainbows.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Get up close and personal with these majestic fish.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

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

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

A former major munitions plant that has been converted into a sprawling art space.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The only place for a truly presidential dram.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The narrowest house in America is seven feet of pure spite.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

A museum and shop on Bourbon Street located in the French Quarter.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

A wall of chewing gum moonlights as collective art.

A walk through the historic city center, under the streets of Seattle.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."