This document provides information about several historical monuments in Delhi, India. It describes the Red Fort, a spectacular piece of Mughal architecture built by Shah Jahan between 1638-1648. It outlines the features of India Gate, a memorial archway built in 1921 to commemorate Indian soldiers who died fighting for Britain. It also summarizes Humayun's Tomb, built in the mid-16th century as the tomb of the Mughal emperor Humayun and notable for its Persian-style architecture. The document concludes with brief descriptions of the Qutub Minar tower and Jantar Mantar observatory.