Built in 1899, this luxurious home was part of one of the first gated communities in Los Angeles.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

A hidden courtyard houses early 20th-century plaster masterpieces.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

The only Leonardo Da Vinci painting in the Western Hemisphere.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This grand gothic brewery has been pumping out suds for over a hundred years.

These two K-9 memorials commemorate the sister cities of Edinburgh and San Diego.

One of the largest trees of its kind in California.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

A very tiny church, bisected by a now-dead oak tree and marooned in the middle of a shopping center parking lot.

Try the frozen treat that inspired Arrested Development's famous banana stand.