The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

Visible below the waves are memorials to the city's Gold Rush dead.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A priceless collection of the Nation's cryptologic history.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The "lovely red Vega" of the legendary record-settling pilot.

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

A much-maligned monument to teetotalism.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Breathtaking and huge 430 year old maps of Italy.

The Pope’s secret escape route.

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

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

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Burial site more than 300 years old.

A maritime museum holding the remains of Blackbeard's pirate ship.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.