This Soviet-era athletic and recreation facility is the highest ice skating rink in the world.

Hundreds of intricately carved Armenian stone crosses can be found within this huge cemetery.

Real bones which are said to have belonged to a Polish dragon.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Dead weights honor the dead of Portugal's fishing industry.

Copenhagen's celebrated theme park and gardens.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The "lovely red Vega" of the legendary record-settling pilot.

A super-sized promotional trick that is now a D.C. landmark.

A haunting tribute to pioneering photographer Clover Adams.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.