A science teacher's dream.

This large, circular tomb is the final resting place of the first emperor of Rome.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

The tallest city hall in the world offers an excellent bento box.

This museum is a full-size replica of an original church constructed during the 13th-century.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

Once the most densely populated place in the world, this island is now a ghost town.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

This abandoned Victorian-style house was built in 1884.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

This quiet island in the middle of a bustling city is actually a volcano dotted with Māori ruins.

A network of fortifications that never saw conflict.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

The abandoned railway bridge stands hidden in the farmland of rural Cumbria.

A historic dam made famous for its turbines and feature in a Hollywood classic.

Abandoned for 60 years, this submerged bridge was completely forgotten until the lake was drained.

Bioluminescent firefly squid light up this Japanese fishing port.

You can still find treasures on the pebbly beaches of one of the world's oldest jade-producing areas.