Where the lovelorn find a home for their sentimental keepsakes.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

An Australian lake whose pink hue defies scientific explanation.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Geothermal waterfalls in Tuscany.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

This freshwater spring fills with 10,000 gallons of water per minute.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

White llama terraces dazzle in Peru's "other Machu Picchu."

Every year, over 25,000 monarchs overwinter in Pacific Grove.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

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

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

A musical instrument played by the sea.