A painted-over wall in Detroit originally built to segregate a black community from an adjacent white development.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

An ever-growing collection of rare and strange objects owned by local Arkansas illusionist Maxwell Blade.

The skeletal white beams stand as a monument to religious dissent.

A Nesting Doll of Churches.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

Architectural monsters are devouring this palace's every door and window.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

The oldest church in Iceland is one of the few to feature ornate decoration.

Akureyri is home to an oversized can of one of Iceland's favourite beers.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

This tiny cabin was home to one of Iceland's most famous painters and was the only land he ever owned.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

The most powerful waterfall in all of Europe.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Climbing Iceland's highest peak on the rim of the Oræfajökull volcano.