A striking symbol of the Bulgarian capital.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

1513 Turkish world map, full of European state secrets and snarky commentary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A section of the long chain that blocked enemy ships from entering Constantinople.

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

This ship offers visitors the chance to spend the night aboard a former floating hospital for fishermen.

These narrow stone granaries have been used to store and dry out grain for hundreds of years.

A 125-meter long "tribute to the Brazilian people."

This stone monument marks the beginning of Portugal's presence in Brazil.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The embalmed remains of the communist leader lie within a custom crystal coffin.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

This lavish estate recalls the opulent history of Calcutta.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Siddhartha Gautama sat here and received enlightenment.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.

Sacred Indian temple that’s all monkey business.

A blooming house of worship for the masses.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.