A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

This unassuming passageway played a key role in one of the most important events in U.S. history.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

Decades before the scandal, this staircase on the river was a literal "water gate."

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

At 207 feet, one of the world's longest continuous escalators.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Yo, Adrian!

Step into a pastel time capsule where candy is truly dandy.

This restored house built from a Sears kit in the 1930s is a physical remnant of FDR's New Deal following the Great Depression.

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

Where the author wrote her beloved "Little House" books.

Elvis's own personal tropical hideaway.

The surprising home of the iconic Santa Monica Pier Ferris Wheel.