A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

The world’s highest ski resort was deserted after an 18,000-year-old glacier melted away.

The way these carnivorous dinosaurs are posed is an homage to a classic work of paleoart.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.

This unassuming retro burger joint was billed as “diner of the future” at the 1939 World's Fair.

A surprising museum of 20th-century technology.

Seven golden statues rise into the sky from sculptor Victor Victori's New Jersey front lawn.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

A historic grist mill and active sluice on the Black River.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

A world-class collection of mechanical musical instruments and automata.

World War II bunker still standing on the New Jersey beach.

This disastrous New Jersey safari park saw animal attacks, escapes, and disease before being abandoned.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

One of the world's largest model railroads is a mind-boggling achievement.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.