The largest of only eight working transporter bridges left in the world.

Fonts are born and bred here at the oldest letterpress type foundry in the United States.

The evocative ruins of a 1,000-year-old hill fort lie within a popular tiger reserve.

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

An exercise in patience and imagination, where Mother Earth turned common stuff into precious hidden treasures.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

The ruined remains of a coal mining ghost town are hidden within the woods.

Home to the deepest rift anywhere on Earth.

Impressive sink holes fill this untouched old-growth forest in the Bahamas.

The homestead of American patriot John Adams.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

The remnants of an early American attempt at missile defense.

A clone of a cloned tree that was so important it allegedly had its own guards.

Home to the world’s oldest seismograph and a four-ton steel ball that makes its own earthquakes.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The water here is so clear you can see the mysteriously sunken ship from the surface.