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

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

Ancient mysterious ruts carved in the bedrock.

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

Abandoned Roman Catholic chapel abused by Satanists before being restored.

The eclectic seaside sanctuary caters to a rather fowl crowd.

A centuries-old forgotten underworld lies beneath Malta.

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

This church is named for one of the most dramatic tales in the early Christian church.

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

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

Stone Age solar temple is aligned with the sun on each equinox and solstice.

This 50-foot-deep sinkhole created in the 14th century is home to rare plants and fungi.

A hidden tunnel of bones in one of Malta's oldest churches.

The largest refracting telescope in Europe is housed on the grounds of a former French castle.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

The famous winding walk at Chartres is surrounded in mystery and myth.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

The site of the first battle of World War II.

Explore the 500-year history of silk-making in Lyon at this museum, workshop, and boutique.

France's national museum of scientific and industrial instruments.

Museum in a swimming pool where the water still flows.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.