Visit the monolithic tomb of America's most famous general.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A bit of retro transportation flair preserved in the world's largest department store.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

New York City's smallest piece of private property.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

This elaborate towering structure was once famed for its revolutionary height.

World's first "penitentiary," meant to be humane, drove men insane.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

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

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

The only presidential monument to display a late POTUS's actual casket.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.

The 25th President's marble casket can be visited in this classical Ohio tomb.

The palatial McDonald's that inspired Wesley Willis.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This historic hotel invented the chocolate brownie.

This tower-tomb honors a president who only held office for a little over a month but dedicated his life to his country.

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

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

The world's longest known cave system.