GW190521 is the most massive binary black hole (BBH) merger observed to date. This catastrophic event, which happened ~4.53 Gpc away from us, gave birth to a ~140 Msun black hole (BH) falling in the still unexplored intermediate-mass black hole (IMBH) regime. Nevertheless, the origin of GW190521 is still a matter of debate: several hints may favor a dense stellar environment as a birthplace. In this poster, I present the impact of three-body encounters on the formation of GW190521-like systems in young (0.3 in LISA band. Finally, I present the role of three-body interactions on the merger rate density of GW190521-like binaries, which in our simulations result as ~0.03 Gpc^-3 yr^-1.
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