A systematic study of fission barrier heights and static properties of even-even actinide nuclei from Th to Cf has been performed within the Warsaw macroscopic-microscopic model using the five-dimensional Fourier-over-spheroid shape parametrization. The use of a large deformation grid, containing about $1.3\times {10}^8$ points for each nucleus, allows for a refined and numerically complete exploration of the potential-energy landscape without dividing the configuration space into subregions or applying interpolation. Barrier heights, extracted via the immersion water flow method, show good agreement with empirical evaluations (including the new IAEA RIPL-4 dataset) with mean deviations below 1 MeV. Special attention is given to the long-debated third, hyperdeformed minimum. For Th isotopes, a shallow but distinct third well appears, whereas it is absent in heavier actinides (U, Pu).

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• Binding energy & masses
• Fission
• Nuclear shapes and moments
• Nuclear structure & decays
• A ≥ 220
• Collective models