This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.

An ancient octagonal weather station named for the eight Greek gods of wind.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

2300-year-old Roman road connecting the empire.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

These two delightful animal-shaped buildings host a visitor center and wool shop.

Watch the seas clash at the place where according to Maori tradition, the spirits depart for their journey to the afterlife.

New Zealand's only running funicular railway.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

The platform atop this verdant volcano was built with the help of a royal elephant.

Largest Kauri tree in New Zealand.

Taumatawhakatangihangakoauauo tamateaturipukakapikimaungahoronuku pokaiwhenuakitanatahu.

Handcrafted thermal spa washes away each night with the tide.

The once and future home of New Zealand's famed Pink and White Terraces.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

Deadly scalding and one of the largest hot springs in the world.

One of the world's steepest streets seems to have houses sliding down it.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.