Two pillars set 10 paces apart commemorate the "last notable American duel."

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

A controversial memorial at the place where Captain Cook met his violent end.

This simple, broken column marks the final resting place of one of America's most famous explorers.

All that's left of the quintessential "cabin in the woods."

Over 200 people were buried here with only a small stone to mark their final resting place.

Railroad came. People came. Railroad left. Town died.

The first full-scale tunnel built in America is short but scenic.

One Confederate statue that accurately reflects the ugliness of its subject.

Mysterious library of an infamous financier and spiritual seeker.

These early tent-shaped grave coverings are unique to Appalachia.

Visit this playground of waterfalls, caves and sinkholes.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The secret city built by the Manhattan Project.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Enormous lake at the bottom of a unique cave system.

Home of an evil witch famous within southern folklore.

This stone memorial pays tribute to a massive shipwreck which was sadly overshadowed by the death of John Wilkes Booth.