Tidbits

1. In the level 'Willard's Lair' in the area with a computer, the covers of TR2 & TR3 are seen.
2. In the level 'Willard's Lair' in the area with a computer, there is a large piece of paper covering a table with the images of the four meteorite artefacts from the main game on it.
3. There is a sign warning Lara to ‘Abandon Hope All Ye Who Enter Here’. This could be a reference to a line in Dante’s ‘Divine Comedy’.
4. In the level ‘Reunion’, at the end of the level, a balloon arrives to take Lara back home. The balloon’s design was one of the earliest examples created. Its first manned flight happened in front of the King and Queen of France on November 21st 1783. It was created by the Montgolfier brothers.
5. Influences for the levels in this game include Thunderball, the 39 steps, Planet of the Apes, the architecture of Art Noveau and Gaudi, Glen Coe, Barbarella, and the Battle of Britain.

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Sources

No. 3
'Abandon Hope...'
http://web.archive.org/web/20121116043701/http://larahcroft.blog.cz/1004/mala-vedomostni-soutez​

No. 4
The Hot Air Balloon in ‘The Lost Artefact’ 
http://web.archive.org/web/20200407082814/http://larahcroft.blog.c z/1106/prvni-horkovzdusny-balon-lara-neleta-nicim-obycejnym  

No. 5
Game Influences 
https://web.archive.org/web/20000412225815/http://www.gamespot.co.uk/news/2000/02/5545.html