A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

Plymouth's huge yet little-known memorial to the Pilgrims.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

This mouldering abandoned mental hospital was once a center for progressive healing.

The oldest continuously inhabited street in America.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

The world's largest man-made underground caverns offer unparalleled underwater wonders.