Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

A little-visited waterfall in an otherworldly landscape.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This elegant arc of a waterfall marks a religious turning point.

The most powerful waterfall in all of Europe.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

The "Seinfeld" diner.

An exquisite and eclectic selection of African masks stands out within a massive woodcarving marketplace.

This sacred, circular cave is lined with pools so clear and still that it's hard to tell where the water begins.

Sitting atop a rock on Michamvi Pingwe beach, this restaurant becomes its own island at high tide.

Over the course of its history, this tiny island has held enslaved people in transit and served as a quarantine zone. Today, it's a giant tortoise sanctuary.

This slowly crumbling mansion was home to one of East Africa's richest and most powerful slave traders.

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

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

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

An ancient knight and a symbol of the city's freedom.

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

Nestled in Uganda's Semliki Valley Wildlife Reserve, is a one-of-a-kind safari lodge.

This breathtaking island on Rwanda’s Lake Kivu is a haven for thousands of fruit bats.

A hiking/biking/exploring trail that winds across over 140 miles of Rwandan shoreline.

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