Prepositional phrases are made up of two or more words which play the role of prepositions. There are a lot of prepositional phrases in Spanish and here is a list of them.

a cambio de – in exchange (for), in return (for)
a causa de – because of
a excepción de – except for
a lo largo de – along, over (a period of time)
a pesar de – in spite of
a propósito de – speaking of
a través de – through, by means of
alrededor de – around
con respecto a – regarding
debajo de – under
delante de – in front of
detrás de – behind
en contra de – against
en cuanto a – about, as for
en medio de – in the middle of
en mitad de – in the middle of
en vista de – in view of
encima de – on (something)
enfrente de – in front of
frente a – opposite
gracias a – thanks to
junto a – next to
lejos de – far from
pese a – despite
por entre – among

Nos vemos prontito.