The best place in the park to test out your throwing arm.

The remains of a 12th-century chapter house in Golden Gate Park.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

An ultra-modern vista that has been featured in so many films the house is a celebrity in its own right.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).

The unbelievably opulent home built for an infamous newspaperman.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This old-world mansion with lush gardens is a gem in the heart of Silicon Valley.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A military museum and library dedicated to the citizen soldier.

Home to a vast collection of The Wizard of Oz memorabilia and the site of an infamous theft.

Terraced flowerbeds and rock sculptures in the midst of the Minnesota wilderness.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Half of a waterfall goes into the river while the other half seems to disappear.

Minnesota's highest point is a scenic vista marked by a plaque and armies of mosquitoes.

The site of Paul Revere's historic two lantern warning.

Narrowest house in Boston.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

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

Summer in the "Turtle Racing Capital of the World" means rousing weekly reptile races.

This bright yellow building is packed with sweet treats from all around the world, from chocolate-covered crickets to whoopie pies.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

Russian history in San Francisco.