Parking garage where Bob Woodward met Watergate source "Deep Throat."

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

An overlooked memorial honoring the local Washington residents who died in World War I.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A crumbling World War I fort that is reached through a series of concrete tunnels.

Legend says this sacred tree was a gift from goddess Athena.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

A secluded oasis of contemporary art and natural beauty.

The West's first incursion into the Afghan world lies buried beneath a military base.

The world's longest bridge fountain has hundreds of nozzles that create a beautiful, illuminated spectacle.

A symbol of hope, survival, and national character, especially after it rose phoenix like from the flames.

Only a few pieces remain of a grand 16th-century water clock that once announced the changing hours with the sound of bells, gongs, and drums.

The best place for scenic views of the DMZ and North Korea.

255 feet of suds, scrubbers, and blow dryers.

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

A small museum dedicated to the king of Western swing.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

These petroglyphs created by ancient Arizonians have withstood centuries of exposure to the elements.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

The former home of the army detachment that captured Geronimo.

One of America's oldest stadiums was also the site of one of the most brutal anti-labor acts in American history.