Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

A pre-Hispanic pyramid in the middle of a tourist district in the Canary Islands.

This 1st-century CE Roman bath sits under a carpark.

This patch of old-growth forest is home to Canada's gnarliest tree.

A massive, gleaming sea turtle with a rider atop its shell looks out over the horizon.

South of Bologna, a limestone grotto with a protruding waterfall and a floor full of cave pearls.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

This unique, full-sized copy of the Bayeux Tapestry sports a few modern additions, including underwear.

Two 2,500-year-old Phoenician boats found on the coast of Spain, giving incredible insight into the ancient maritime traders.

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

The short hike is worth the stunning views and crystal blue waters of a secluded beach.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

Massive galleon from a box-office bomb docked in Genoa.

The fragmented remains of a massive public bath connected to the city's water supply.

This aircraft museum is home to one of just three Halifax bombers in the world.

Long tunnels run under the ancient chariot racing circuit to the tower.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

Climb a set of vertiginous stone steps to the top of this impressive ancient edifice.

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