San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

These dramatic cola-colored falls have appeared in a poem by Henry Wadsworth Longfellow and a song by Sufjan Stevens.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

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

This historic World War II ship is one of only 4 Fletcher-class destroyers remaining worldwide.

Experience the pivotal Civil War battle at this interactive museum.

The oldest farmer's market in America is so ancient it was approved by the King of England.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

Europe’s oldest natural human mummy.

The European Union’s tallest freestanding structure provides radio and television broadcasting to half of Latvia.

This historic bridge connects Whidbey Island to Fidalgo Island across whirlpool-filled waters.

Every year, a sparkling cave is sculpted in the icy heart of a glacier.

A perfectly preserved example of a fortified Medieval ricetto.

This splendid tomb may look fantastic, but there's nothing in it...

Devilish masks, handicrafts, and pieces of old buildings create a snapshot of life in a historic Alpine region.

John Wayne, Ronald Reagan, and other Hollywood actors have resided in this picturesque Route 66 hotel.

This 18th-century tower is locally iconic.

It's just another skyscraper, but it's shaped like '90s cell phone.

The ruins of a pre-Columbian fortress city so secure it held off the Spanish conquistadors for over 20 years.

This museum covers 10,000 years of Pre-Columbian Latin American history.