The longest navigable underground river in the United States is home to countless blind and albino animals.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

In which a local geological marvel becomes a quaint roadside attraction.

Malcolm X's house during his most formative years faces an uncertain future.

These items are all that remain from the room used by the author during his second tour of the U.S.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

Painstakingly built dioramas sit unnoticed in a Boston office building.

These whimsical works of art tell the story of the city's past and present.

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

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

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

A beautiful Victorian-era cemetery, complete with a miniature village.

A grassroots community effort in the 1970s led to the creation of this beautiful garden full of delightfully whimsical exhibits.

An old bank vault in Atlanta is now the eternal shrine to the King of Rock and Roll.

3/4-scale model of the White House in Atlanta, Georgia.

Secret gardens just a few miles from downtown Atlanta.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

This North Carolina store preserves a historic moment in America's movement for racial equality.