The only structure left with direct ties to the Salem witchcraft trials of 1692.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

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

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

On the Oregon coast there is a natural hole that seems to be draining the sea.

An exquisite tunnel of cascading flowers.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A museum in the heart of Virginia peanut country devoted to the humble goober.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

One tiny triangular park commemorates the victims of a yellow fever epidemic—many of whom are buried right below the grass.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.