20 towers visited by Susanne Oberlinger

30 St Mary Axe

Big Ben

Burj Al Arab

Burj Khalifa

Cairo Tower

Chrysler Building

Dubai Marina

Empire State Building

Euromast

Fernsehturm Berlin

Flatiron Building

Galata Tower

Isartor

Main Tower

Old Town Hall

One World Trade Center

Powder Tower

Prague Astronomical Clock

Stadtturm

Torre del Oro