An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

Washington's iconic carousel has a nice piece of Civil Rights history.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

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

Largest Roman Catholic church in North America.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The site of the climactic scene from the classic horror film is now a historic landmark.

There must be a pun in this haystack somewhere...

The site of the deadly Triangle Shirtwaist Factory Fire.

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

Elevated freight railway turned wildly successful urban park.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

Second largest wastewater treatment plant in the country.

This supermarket is suspended 25 feet above an interstate highway.

The world's largest piece of copyrighted artwork.

Hill-like structures formed by glaciers and sandy spits of land.

A daybeacon pyramid is about all that's left of this island that is said to have sunk due to a pirate's curse.

The site of the tragic isolation of Nipmuc Native Americans left to perish in King Philip's War.

This old mill and former police station now present a world-class collection of Orthodox iconography.

Solar powered Spectacle Island features all-green facilities.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The oldest surviving wood-frame building in North America is still in the family.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.