By public opinion, this is Canada's knottiest tree.

Saved by a logger, this Douglas fir is one of the last great old-growth trees in Canada.

Defying all odds, this lonely little tree found a home on a log sticking out of a Canadian lake.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

A fiery-red region of scooped out land still largely untouched by civilization, tourists or otherwise.

A celebration of solstice followed by a fiery purging of evils.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

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

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

Rare karst landscape eroded from a flat seabed.

A charming Spanish village sits atop this natural limestone overpass.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

Village situated on a narrow volcanic escarpment.

Cliffside houses provide a spectacular view from their perch above the valley.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.