This black church sits alone among a field of lava rock.

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

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

Iceland's largest lagoon is home to stunning multi-colored icebergs.

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

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

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

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

A tower devoted to — and modeled after — the Divine Comedy.

Constructed on the ruins of a convent, this tower saved countless lives.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

This striking art museum holds an amazing series of curiosity cabinets.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

A spherical "micro-nation" in the heart of Vienna.

The topiary maze at the Habsburg hunting lodge.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Museum dedicated to the terror regimes of Hungary.

Once the home of a hermetic monk, this cave now houses a small church.

Fantastic views and thousands of love locks.

A monumental underground karstic wonderland is also the water source for over a million citizens of Beirut.

One of the oldest monasteries in the world is a key pilgrimage site for both Muslims and Christians.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

One of the oldest and largest castles in the world.

Ruins of the Crusaders' headquarters.