Gustave Eiffel's masterpiece until the Eiffel Tower was built.

The first safe in this California town had to hold all the gold.

An old whaling station now serves to give the public a look at the commercial whaling industry, no longer a part of Monterey's economy.

Tiki luxury on Nob Hill.

An eerie reminder to the horrors of World War II.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The wooden airship was the largest flying boat ever built.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Its collection includes a broad array of social, geographic, graphic design, and political history.

A subterranean house of worship carved right out of the bedrock.

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

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Early prototype for Frank Lloyd Wright's Guggenheim.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

Hawaii’s largest cemetery rests inside an extinct volcano crater.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.