Stones speckled along Harris Avenue reveal hidden nuggets of the past.

Not for the faint of heart, this long pedestrian bridge rewards those who brave the wobbly walk with a beautiful view.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

This amazingly preserved Gold Rush town is a historian's dream.

A black cottonwood gets a second life as a home for books.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

A Byzantine-era church hidden in a wooded area below the Acropolis.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

This once-derelict building is now one of the most beautiful bookstores in the world.

The California capital city once stood 10 feet lower than it does today.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Romania's triumphal arch looks out over Bucharest.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

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

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

Open day and night, a church with three pews and Bibles.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.