This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Go inside a revolutionary, cage-less zoo where 35 species live and some of them roam free alongside their human visitors.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

Yup, that's a 330-foot yacht passing over the highway.

This functional solar system model was inspired by the famous Eisinga Planetarium.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

An effigy of the deity emerges from a temple's water every 40 years.

A towering work of stone and philosophy that was constructed using ancient Hindu science.

This precariously balanced boulder is said to be a hunk of stolen butter dropped by the gods.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

There are millions of temples in India, but only one prominent temple dedicated to the Hindu creator god.

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

The painted and decorated towers of this Hindu shrine were once the tallest structures in one of the oldest cities in India.

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

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

Modest by day, illuminated majestically at sunset.

A blooming house of worship for the masses.

This experimental utopian "city of the future" in rural India may hold a dark secret.

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

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

More than half of this Indian palace is drowned but it looks all the more spectacular for it.