This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

An underwater restaurant, surrounded by a coral reef.

These otherworldly formations were shaped over millions of years by the forces of nature.

The remains of a 19th-century school and living quarters are perched atop a mountain surrounded by a thick tropical forest.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

An enormous Polaroid picture adds an artistic flair to Rotterdam.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

One of the oldest libraries in the world is still operating and contains the oldest existing document in the Italian language.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

This beautiful 150-year-old synagogue survived Italy's fascist period and the Second World War.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.