The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

The cedar tree in Highgate Cemetery earned its title by accident.

The world's largest and most outstanding marl lake regularly changes color.

The world’s largest work of glass art hides in this stunning Taiwanese subway station.

Walk through Czech history in Prague's largest graveyard.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

The world's tallest bridge is also possibly the most elegant.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

A unique seaside cave where Aleister Crowley faked his own death.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Certain traditions prevail on the least-visited island of the Aran Islands.

This frequently-photographed waterfall takes only a short hike to visit.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

An intricately carved Viking church overlooks a glistening fjord.

An elevator into the Baltic Sea.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

A part of the world's largest marsh seems to be growing bright red Martian grass.