The Taj Mahal in India is estimated to have cost approximately 32 million rupees, which is equivalent to roughly $827 million USD today.
The Great Wall of China, a series of fortifications stretching over 13,000 miles, is estimated to have cost around 2.3 billion yuan, which is equivalent to approximately $356 million USD today.
The construction of the Colosseum in Rome is believed to have cost between 50,000,000 and 100,000,000 sesterces, which is equivalent to approximately $40-80 million USD today.
The statue of Christ the Redeemer in Rio de Janeiro, Brazil, cost approximately $250,000 USD to build in the 1920s, which is equivalent to roughly $3.5 million USD today.
The Parthenon in Athens, Greece, is estimated to have cost around 469 silver talents, which is equivalent to approximately $638 million USD today.
The construction of the Eiffel Tower in Paris, France, cost approximately 7.8 million francs, which is equivalent to roughly $1.5 million USD today.
The Pyramids of Giza in Egypt were built over a period of several generations, and the total cost is unknown. However, estimates suggest that the Great Pyramid alone may have taken around 20 years to build, with a workforce of up to 100,000 people.
The Alhambra in Granada, Spain, was built over a period of several centuries, and the total cost is unknown. However, it is believed that the construction of the Nasrid Palaces alone took around 100 years.
The Angkor Wat temple complex in Cambodia was built over a period of several decades, and the total cost is unknown. However, estimates suggest that the construction of the complex may have taken up to 300,000 workers and cost the equivalent of several billion dollars today.
The construction of the Statue of Liberty in New York City, USA, was funded by both France and the United States. The French government covered the cost of the statue itself, which was approximately $250,000 USD at the time (equivalent to around $6.4 million USD today),