A restaurant and observation deck built in a unique broadcasting antenna.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

"The most colorful grottoes of the world.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

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

Research station devoted to mysterious floating lights seen in a Norwegian valley.

Norway's chilly all ice-instrument festival.

Walk 2,300 feet above the ground on the "Troll's Tongue."

A stunning silver lining to global warming's gloomy cloud.

360° views of the city plus five floors of optical illusions and hands-on science.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

This stately estate house features a tower covered in a bright, modern mural.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Medicinal spa created with the discharge from a geothermal energy plant.