360° views of the city plus five floors of optical illusions and hands-on science.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

The first declared National Monument in the United States.

Two adjoining collections of 19th-20th century physics apparatuses and instruments.

This lab's maddening silence is good for business but bad for sanity.

Hidden in the shadow of a rocky fortress is one concubine’s long-forgotten legacy.

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

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

Ornate, dome-topped cenotaphs fill this royal crematorium.

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

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

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

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

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

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

A mecca for India's Jains.

This rare basalt crater lake is used to study the Moon and Mars.

In Mumbai, a bright blue synagogue is the largest one for the Baghdadi Jewish community in Asia.

The only Chinese temple in Mumbai.

World's most expensive home.

A centuries-old lookout post still sits atop a natural stone spire.

The place of worship for Zoroastrians, Mumbai's Parsi fire temples use fire and ash for purification.

An extraordinary "City of Caves" carved from solid stone.