This stretch of highway is said to be haunted by ghosts of settlers whose graves were paved over.

Mariners once used this prehistoric landfill as a navigational landmark.

Ruins of a Carnegie family mansion on Cumberland Island.

A museum dedicated to exhibiting remarkable outsider art.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Elevated freight railway turned wildly successful urban park.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The world's second largest single-dish radio telescope, once used to contact E.T.

Golden Gate Park's historic collection of plants.

Tiki luxury on Nob Hill.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Bug-devouring flora are the stars of a special wing of the glass conservatory.

Human skulls and a stuffed goat made into a rocking chair can be found at this strange little store.

One of the last of the great 1920s movie palaces is a Floridian Greco-Spanish-Persian dreamscape.

The only ancient owl carving found east of the Mississippi.

The culprit who accidentally lit this 3,500-year-old tree on fire stated "I can't believe I burned down a tree older than Jesus."

The third tallest lighthouse in America once guided author Stephen Crane to safety.

A building so large that it has its own weather.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A vast array of tropical plants collected by a vacationing couple.