A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This haunting sculpture stands as a memorial to the torture victims of the Brazilian military dictatorship.

This attraction is devoted to the wonders of steam power and features a replica of one of its most public disasters.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

This Brazilian town built by Freemasons is full of colonial Masonic architecture and symbolic imagery.

This "Little Finland" started as a Finnish utopian society in Eastern Brazil.

Museum precariously perched on a massive yellow pillar.

An art museum with an eclectic design and a scandalous past.

Solitary monument dedicated to the beauty of nature.

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

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

These temples are among the oldest free-standing stone buildings in the world.

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

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

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

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

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

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