A memorial to a shareholder activist feared by CEOs around the United States.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Northern Ireland's Brobdingnagian stepping stones.

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

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Rising from the sea like a stone monster.

2300-year-old Roman road connecting the empire.

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

The world's second-largest sundial, made entirely out of stone.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Sacred Indian temple that’s all monkey business.

A blooming house of worship for the masses.

An ancient iron pillar in Delhi that seems to be rustproof.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

A nearly unconquerable island-fort in the Indian Ocean.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

World's most expensive home.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Rebuilt remains of a temple to Roman god Mithras.

Notorious artist squat renovated into legal studios.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

An astounding collection of medical specimens, including bits of President Lincoln.