A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

A memorial marks the library lobby where Langston Hughes' ashes are buried.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

A crumbling hospital from the 1850s on Roosevelt Island.

Supposed Massachusetts Grave of a pre-Columbus Knight Templar.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

The massive machine creates cracking displays of indoor lightning.

Friction between grains of sand cause a curious "singing" sound.

Nature and religion are reunited at this unconventional church in the forest.

The world's oldest and largest museum of mass transit vehicles.

After giving up Michelin glamour for his Amish faith, one chef now makes stellar sausages in a small, off-the-grid shop.

The remains of a hospital ravaged by fire, once a progressive place of innovations for disabled children.

A wedding chapel, vintage clothing shop, and bar all under one roof.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Built to bless whalers before their voyages, this Massachusetts church now features a ship-shaped pulpit.

This stone tower in a small town's graveyard looks as though it would be more at home in a fairy tale.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

Narrowest house in Boston.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

A Chicago Movie Palace Lost to Time.

This rare female version of the Muffler Man has its clothes removed each summer to signal the start of pool season.