This set of mysterious petroglyphs in the Peruvian jungle could shed light on centuries-old activities in the region.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

A scenic ravine with an astounding collection of rock art created by the Indigenous people of the Great Plains.

Walk over a 150 year old manhole.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

Called the “General Motors of the piano industry,” these buildings once produced as many as 700 pianos a week.

Eclectic architecture in the woods of New York.

The press that first printed the Book of Mormon.

Explore the evolution of printing technology, from cuneiform to Kindle.

Artistic cabins actually grow deep in the Canadian wilderness.

It's clear this abandoned Art Deco gem was no ordinary cleaners.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

This tiny, charming synagogue in the Cayman Islands was built by a man as a present for his Jewish wife.

A giant portrait of an ancient king looms over the river.

The central mosque of this Mali town is entirely built from mud.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

Lonely industrial sculptures in South Australia created by a mechanic turned artist.

At the United Kingdom's only residential library you can sleep among the books.

An exotic jungle hideaway run entirely by indigenous Kichwa women.

A historic hotel on the edge of the Australian outback.

Balconies that have a most unusual accent.