Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

After suggesting criminals be burned to death on this rock, a king's advisor suffered his own punishment.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

The most biologically diverse protected area in Africa is also the most dangerous.

These naturally balancing rocks were pictured on every Zimbabwean banknote, up to the 100 trillion-dollar note.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

A Zulu warrior is buried far from home, near the very northern border of Zambia.

The first Catholic Mission to the Bemba people of Zambia still stands.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

Freddie Mercury's childhood home is now a monument to the iconic Queen rockstar.

Once a meeting point for Swahili slave traders, this ancient tree is now a monument to those killed by the slave trade.

This old brick building has held everyone from prisoners of war to freedom fighters during its turbulent history.

A small cemetery on a hill overlooking Mbala contains the history of the town's colonial past.

Rare pigmented engravings cover the walls of this Stone Age shelter.

A memorial marks the spot where a plane crash killed several United Nations members on a peace mission to the Democratic Republic of the Congo.

The ruins of a massive World War I fort overlook the border between Zambia and Tanzania.