From The TimeSplitters Wiki

Graveyard
Size	Large
Location	Walled Graveyard
Climate	Night
Unlockable	"Tomb" on Normal
Recommended Bots	N/A
Recommended Weapons	N/A

Graveyard is a fairly open level although sometimes confusing map. It has an underground section, and a church. It only appears in Timesplitters 1.