Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The oldest continuously operating farm in New York State.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

The site of the climactic scene from the classic horror film is now a historic landmark.

Second largest wastewater treatment plant in the country.

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

Statue commemorating the use of ether in anesthesia.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

At 207 feet, one of the world's longest continuous escalators.

Elevated freight railway turned wildly successful urban park.

The most confusing clock in New York.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

See massive fossils that are over 200 million years old in northeastern Arizona.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Largest lake in Great Britain measured by surface area.