Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

Artifacts of whaling, with both its perils and adventure, are housed in this museum in a former candle factory.

A unique columnar residence built in the 19th century.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

This is the house that spite built.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

An old Danish political institution where members of government can grab a drink off the record.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This sublime architectural marvel is a rare example of an expressionist church.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A century after his death, this covered bridge still calls to mind the plein air painter who loved it.

Ice cream stand, snack bar, and time capsule of milk conveyance.

The Boston square dedicated to the dark poet who was born nearby.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

One of America's most historic homes also holds a startling literary legacy.

The hill that gave the Massachusett tribe, and later the state, its name.