Indents in the pavement are all that remain from a grisly death machine in Paris.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A surrealist timepiece by the artist of melting clocks.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Quite simply the largest tree in the world (by volume).

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

The angel of death appears to weep black tears at this grave marker.

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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

A beautiful geyser under environmental threat.

Mysterious rocks that ring musically when struck.

The first declared National Monument in the United States.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A bizarre house filled with an astounding array of collections.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.