When Tikal was a living city, it was clear (no jungle) and the different plazas and building complexes were connected by causeways. Today, you walk from complex to complex under a jungle canopy and it can be difficult to keep oriented to how the city looked overall.
According to our guide Noah, the population of Tikal at its peak was 80K - 100K, which would have put it on par with the largest European cities at that point in history. (On a related note, the population of Belize during the peak of Maya civilization was reportedly 1M. Today it is just over a quarter of that, 280K.)