Part of one of the largest flooded cavities on the planet, and littered with prehistoric animal bones.

The haunting peak of an old church is all that remains of a drowned Brazilian city.

Designed to allow funerals to proceed over the River Dulnain.

Tour the sci-fi-esque reality of governmental disease management.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

This restaurant, art gallery, and nightlife hot spot is a love letter to Lagos from St. Louis.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

This museum houses a large collection of old motorcycles.

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

Outside of Budapest, a reconstruction of a 16th-century fortress.

Mexico's astounding mummy museum with "the world's smallest mummy."

This colonial mining complex is now home to magnificent themed gardens.

This colossal underground passage paved the way for large-scale drainage and access tunnels across the U.S., but it almost wasn’t built.

Italy's curious field of mud volcanoes is named for being both gross AND salty.

Hundreds of Roman amphorae are stored in an ususpecting underground parking lot.

The oldest surviving stele in Japan is a personal dedication from a monk to his late mother.

Believed to be the capital of the the ancient kingdom of Dál Riata.

This horseshoe-shaped waterfall is the second-largest on the African continent.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

This section of the Kennet and Avon Canal has been designated the same level of heritage protection as Stonehenge.

The oldest of the three remaining bridges in England with buildings on top of them.

The longest staircase lock in Britain.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

The true meaning behind this sculpture remains unknown.