Light still pours into the ruins of this ancient Islamic observatory.

The remains of an ancient city-state along the Silk Road.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Located in the Horniman Circle area, this church marks the historical Zero Point of Mumbai.

This 19th-century heritage building once housed a department store that supplied British provisions in the city.

A tribute to the area's namesake and King Edward VII.

This 16th-century mosque is the hallmark of the African architectural legacy in India.

This 15th-century mosque is a beautiful blend of Hindu and Islamic architecture.

This magnificent stepwell is designed as an inverted temple and adorned with 1,500 sculptures.

An architectural marvel that dates back to the zenith of Indian architecture.

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.

In Old Goa, the former residence of the archbishop now houses a permanent exhibition.

These animal carvings stand as a representation of India and Britain.

A giant repository of accidentally discovered cave paintings up to 30,000 years old.

A complex of six forts embedded in the Rajasthan hills.

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

A volcanic crater that visitors can look inside.

A sliver of 19th-century Germany sits on the shore of a Chilean lake.

This museum covers 10,000 years of Pre-Columbian Latin American history.

This sculpture meant to honor the bravery of the Indigenous Mapuche people of Chile proved controversial.

The world's most remote airport.

This was once the center of the Birdman cult, and is now a World Heritage Site.