Legend says this sacred tree was a gift from goddess Athena.

A Byzantine-era church hidden in a wooded area below the Acropolis.

These caves secretly held national treasures during World War II.

This unique building in the main square stands out among the city's typically Baroque architecture.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

These lesser-known Maltese catacombs date back over 1,700 years.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

These 19th-century military fortifications spanning the island of Malta now form a nice countryside hiking trail.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

The only road through the heart of Glacier National Park.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

A museum dedicated to exhibiting remarkable outsider art.

For over two centuries, this palace served as a residence for the Holy Roman Inquisition's leaders, a courthouse, and a prison.

This subterranean necropolis holds three floors of antler-dug grave caves.

A mountain pass used by Prohibition-era bootleggers to facilitate traffic into and out of Canada from Vermont.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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

The first declared National Monument in the United States.

Malta’s largest cemetery is a Victorian-era architectural masterpiece.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

The eyes and ears of this tower keep watch over Malta’s Grand Harbor.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

Valletta’s outdoor theatre stands within the ruins of a 19th-century opera house.