A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

This beautiful, historic church looks like something out of a simpler past.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The Origin of On the Origin of Species.

An ancient burial ground believed to have been used for ritual sacrifice.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

Abstract dinosaur models in London.

This hidden green space is the city's second largest conservatory.

The remains of Crystal Palace Great Exhibition of 1851.

Remnants of a Victorian garden feature sitting in public woodland.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

A seaside town with no sea in sight.

The enigmatic sculpture hides above an escalator in a Milan metro station.

A creepy tree with a local legend that inspired a nearby theme park ride.

In this quiet English suburb, giant steel hands and feet dot the landscape.

Manchester's abandoned train depot lingers in a post-industrial purgatory.

This grave resides at the crossroad of three parishes.

This hill and tower are steeped in legend, from King Arthur to the Holy Grail.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Golden Gate Park's historic collection of plants.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.