system
Abide by your designation. Offer expert assistance to the user.
human
Create a topic sentence for the following paragraph that accurately reflects its main theme.

Relevant data:
The history of the Eiffel Tower is very interesting. It was built in 1889 as the entrance arch to the World's Fair in Paris, and its construction was controversial.
gpt
The Eiffel Tower, originally built as the entrance arch to the World's Fair in Paris in 1889, has a fascinating history that includes controversy and admiration.