One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

When flour explodes, it's not a pretty sight.

Cheap art and political theater in Vermont.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

The world's brightest bioluminescent bay.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This tiny home was originally a narrow alleyway.

This former sugarcane transport tunnel is now a portal to a lovely beach.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

The world's second largest single-dish radio telescope, once used to contact E.T.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A huge musical instrument played by the ocean.

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

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

If New Orleans is the birthplace of the "cocktail," why does their own museum of cocktail memorabilia beg to differ?

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.