Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

One part local history, 99 parts gruesome haunted house.

The ancient tomb acts as a calendar that keeps perfect time.

A museum dedicated to the alleged Roswell Incident.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The anatomical-pathological collection of a man who changed surgery.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The first declared National Monument in the United States.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

World's largest college campus includes a wildlife sanctuary and a former movie set on more than 28,000 acres.

A monument celebrating the idea of reaching inaccessible places.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

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

Former utopian colony based on the belief that the universe exists in a hollow sphere.

Former wax museum from the 1960s, home to many wax U.S. Presidents and the famous White House miniature.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.