What would young people around the world build with China's infrastructure capabilities?

The Hong Kong-Zhuhai-Macao Bridge, a mega infrastructure project, has set multiple world records. If young people around the world had access to such infrastructure-building capabilities, what would they use them to create?

Some envision cross-border railways, urban metro systems and better transport for remote areas. Others hope more countries can follow China's example by extending power grids across mountains and bringing electricity to households far and wide. The value of infrastructure lies not only in spanning mountains and seas or bringing people closer together, but also in improving lives, benefiting communities and bringing development opportunities within everyone's reach.