Coins and medals straight from the mint await visitors to this shop in the nation's capital.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

This groundbreaking 16th-century map is known as "America's birth certificate."

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

The trials and tribulations of marking Poe's grave.

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

Once America's tallest structure, now a Baltimore landmark.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The National Park Service’s best-kept secret with views that rival any in D.C.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

Once home to the largest photo service in the United States.

This nine-story building is the oldest standing skyscraper in D.C.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.