A walk through the historic city center, under the streets of Seattle.

After much poking and prodding, this island is decidedly not a magnetic anomaly, but it sure is pretty.

Dedicated to an "Unknown Man," this grave holds either the remains of a lovelorn suicide or a Cold War spy.

The largest collection of Indigenous Australian artifacts in the world, and the rare museum where wood-and-glass cabinets have trumped interactive exhibits.

Come for the flowers, stay for the bats!

The yawning remains of a complex naval fortress still haunt this Australian shore.

This abandoned bunker looks out over the Atlantic from its clifftop perch.

A medieval village holds a very modern hotel.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

An ancient Egyptian temple in the middle of Madrid, Spain.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

The world's most elegant power lines.

Single runway interrupted by a busy road that cuts across its middle.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.

This historic Rhode Island mini-cemetery features a number of headstones run through with mysterious holes.

Mysterious stone tower featured in many alternative histories of the New World.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Southern Ocean waters and glacial forces transform the Antarctic ice into these stunning bridges and caves.